firewall: dont create duplicate ACCEPT rules
firewall: dont create duplicate ACCEPT rules

and have only one rule for all ports.

Duplicates can be cleaned from existing hosts via:

  for port in 22 80 443 3000 4000 4040 5000; do
    while iptables -D FORWARD -p tcp --dport $port -j ACCEPT; do
      echo -n .
      done
    echo
    echo $port done
  done

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